Socketed screw



Patented June 9, 1942 UNl'iE' STATESV PATENT OFFICE socxn'rnn scnnw f a. Purcell, west Hartford, conn., as-

- signor to The Bolo-Krone Screw Corporation,

a corporation of Connecticut Appneanon Mayas, 1939, senaiNo. 275,903

(cias-45) 9Claims.

v'My inventiony relates to socketed screws.

More particularly, i-trelates to screws `of the type adapted to be produced by the preferred form of method and apparatus described and claimed in my copending applicationSerial No. 275,904, led May 26, 1939; a further 'type of such screwA also being described and claimed in my copending application Serial No. 275,902, tiled May 26, 1939.

It has among itsobjects to provide an im-4 proved socketed screw, and, more particularly,

an improved screw of the type utilizing cooperating convex and concave lbinding and guiding surfaces n the screw socket and on the screw driver. A further object of my invention is to provide such a screw having a socket of improved conformation, whereby, while obtaining the ad-` vantages of this type of screw, it is also made possible to provide an ven larger target.- A still further object of my invention is to provide such an improved socket having improved iluted portions and improved abutment means between the iiuted portions whereby,v while obtaining a target of larger diameter and reducing the metal in the socket wa11,it is also made possible to produce a Fig. 2 is a side elevational view oi the screw,

partially in section, on line 2 2 of Figure 1, a

tate illustration;

Fig. 3 is a sectional view on line 3 3 of Figure 1;

Fig. 4 is a vsectional view on line 4 4 of Figure'2;

Fig. 5 is a sectional view on line 5 5 of Figure 2; f

Fig. 6- is a section of the screw similar .to Figure 2 showingthe driver in process of insertion therein;

Fig. '1 is a like sectional view but showing the driver in section and fully inserted in the screw; Fig. 8 is a view similar to Figure 3, but with the driver fully inserted;

, abling this socket 2 to present a substantially Fig. 10 is a detailsectional view showing a' modified form of driver inserted in the screw.

In this illustrative construction. the screw head l is provided with a socket, generally indicated at 2, and this socket 2 is provided with radially located iiuted portions, generally indicated at 3, having convex end orouter walls 6; the socket 2 and iiuted portions 3 herein, however, being of improved construction andhaving improved abutment members 5 between the adjacent uted portions,- and my improved socket also being adapted to cooperate with a suitable screw driver,

generally indicated at-S, all as hereinaftermore fully described.

' Referring to the socket 2, be observed that both the fluted portions 3 and the abutment portions 5 are of an improved construction enlarger mouth or target for the screw driver. More particularly, referring to the fiuted portions 3, the side walls 8 thereof are such that, instead of the width of the uted portions'increasing from the convex end wall 4 toward the axis of the socket, the cross section of the uted portions decreases fromthis end wall I toward the axis.. Herein, this is accomplished by providing at side walls 8 extending inward from the opposite side edges of the convex surfaces d, which converge as they approach the axis. Further, these side walls 8 are short, as compared with my prior construction o! this type, and the adjacent side walls of adjacent' iiuted portions do. not intersect. Instead, it will be observed that'the abutments 5 are of substantial width at their inner ends and herein have curved 40 portion of the fshank being broken away to Iacili- .surfaces'9 forming their inner ends and also forming the marginal walls oi the target portionof the socket. It will also be observed that these surfaces 9 are convex vertically, as shown in Figure 3, in such manner as thereby to increase the size of thetarget at the open end of the socket. Here also, it will be noted that, as heretofore, the convex end walls I of the fluted portions 3 are more abruptly angled at theirl inner ends,

as indicated at la, adjacent the bottom ofthe socket 2, in such manner a's to provide the 1desired binding or wedging effect on the-screw driver, while the surfaces 9, iiaringv away at their upper ends, also produce the wider mouth at the upper end of the socket.

Cooperating with my improved socket is also a screw driver having longitudinally disposed andwalls I3 are provided between the ribs I0. Thus' obviously, when the working end of the screw driver is inserted in the socket 2, the concave portions II on' the ribs` thereon will engage with the end wallsA 4 .of the uted portions and produce binding or wedging at the portions la, as indicated in Figure 7. Th ribs I also will have the inner edges of their side walls I2` engaging the side walls 8 of the iluted portions 3, but it will be observed that herein the entire surfaces` of Kthe walls I2 on ribs I0 will not engage corresponding surfaces on,the socket and further rthat the surfaces I3 between the ribs III on the driver will not engage the surfaces 9 except atthe bottom, (Figure 8). In connection with the side walls I2 and B on the driver and fiuted portions, it will be observed that the angle of these is such that any camming tendency is eliminated, while the construction ofthe head is such'as to produce a very ystronghead despite .the largertarget.

In Figure 10, it will be noted that a modified form of screw driver Il is illustrated having the end wall of its ribs-concave,` as heretofore. to cooperate with the portionsgld on the inner end of the convex end walls 9 in the socket I. However, in this construction the concave end walls I9f on the ribs; corresponding to the end walls II heretofore described, slope away from the end 'wall l above the binding portion la, rather than engaging the wall 4 throughout the length thereof.

In the use of my improved construction, the driving tool is inserted in the socket 2 with increased facility, due to the increased size of the target provided, and herein defined by the upper ends of the walls 9. Further, at the same time that the target is thus increased in size. it will be observed that the abutments 8 are substantially increasedin thickness and strength, while the iluted portions I and their cooperating rib portions Ijll are so disposed that the latter p0rtins-cannot mutilate the abutment portions or tend to explode the head of the screw. In fact,

of said socket.-

described certain embodiments which my inven. tion may assume in practice, it will 'be understood that these forms have been shown for purposes of illustration, and'that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims. v

-What I claim as new and desire to secure by letters Patent is: l

1. A socketed connector havingl a turning socket therein including an axial aperture having spaced wall portions around the same and radially located fluted portions between said wall portions, and turning toolbinding lmeans vin said socket, saidfbinding means having increasingly sharp binding angles leading toward the bottom 2. `A socketed connector having a turning socket therein including an axial aperture and radially located viluted portions between portions of the walls thereof and arcuate inner faces on -said wall portions, and turning tool bindins means disposed around the bottomportion of said socket, said binding means having increasingly sharp binding angles toward the'inner end of the latter.

3. A socketed connector having a turning'.

socket therein including a conical axial aperture and shallow radially located i'iute'd vportions in the walls thereof of less depth than the radius of said aperture, and turning tool binding means in the bottom portion of said socket, said binding means having increasingly sharp bind-' ing angles4 toward the inner end of said socket.

'4. A socketed screw having ia turning socket therein including a conical axial aperture and radially located fluted portions in the annular walls thereof, and turning tool binding means in the bottom portion of said socket, said binding means having increasingly sharp binding angles toward the inner end of saidsocket, and said portions having abutments therebetween having arcuate inner extremities forming the annular walls of said conical aperture.

5. A socketedscrew having a turning socket therein including an axial aperture and radial- '1y located nted portions in the walls thereof,

due to the slight undercutting of the walls l and,

I2, a shearing action is required before the rib portions III can rotate relative to the uted portions l. Obviously, as regards guiding the tool into the socket and the gripping or binding action between the convex surfaces l and concave surfaces II, this construction will function A`generally similarly to previous' constructions of the convex-concave type. 1 Y

As a result of my improved construction, itvwill `be noted that, while vthe target 1s nrger and a advantages of my improvements will, however,l

-said aperture.

and turning tool binding-means in the bottom portion of said socket, said binding means havving increasingly sharp binding angles toward the inner end of said socket, and said portions having abutments* therebetween and having side walls on said abutments intersecting the walls of 6. A socketed screw having an axial turning socket therein including an axial aperture and radially locates acted portions, and having side walls on said portions spaced apart at their ends toward the socket axis and forming abutments between said portions having faces forming walls rof said axial aperture, the faces-of said abutments having vertically convex tool binding surfaces thereon adjacent the bottom of said socket.

l'1., A socketed screwhaving an .axial turning socket .therein including radially located fluted portions having lside' walls leading into said socket, intermediate abutment portions having their side walls formed by the sidewalls of said iluted portions and'spaced apart at their ends toward the socket axis..and turning tool binding means Vo'n walls of said abutment portions, said' binding means having increasingly sharp bindingkatngles leading toward the bottom of said soc e in this application specifically '15 8. A socketed screw having an axial turning socket therein including radially located fluted portions having end walls, intermediate abutment .portions having their side walls formed by the side walls of said iiuted portions and spaced apart at their ends toward the socket axis, and turning tool binding means in said uted portions, said binding means having increasingly sharp binding angles leading toward the bottom of said socket.-

9. A socketed screw having a conical axial turning socket therein including radiallydocated uted portions having side wallsl'leading into said socket; intermediate abutment portions having side walls formed by the side walls of said fluted portions and spaced apart at their ends toward the socket axis, and turning tool binding means on the end walls of said fluted portions and on said abutment portions, disposed adja-l cent the bottom of said socket and said binding means having increasingly sharp binding angles 10 toward the bottom of said socket.

WILnIAis/rli.PURTELI.,'l 

